Jim, i beg your pardon but not all rim cutters are built into chamber reamer! i have cut a good many rims for 20 gauge shells on the new old stock Fox barrels and i have a rim cutter that is made for that purpose ,not to ream chambers.It could very well be the problem. If rims cut too deep all the way around firing pins need to be longer in order to fire the shells. Bobby
I'm happy to be corrected Bobby. However, surely the separate rim cutters you describe would still be intended to cut the rim recesses perpendicular to the bores, wouldn't they? If not, why not? In this gun the rims are obviously(to me, at least) cut too deep already, whether they are square with the bores or not. That's why the primers are backing out of the battery cups, as is clearly shown in the pictures.
